In a bowl combine oats, brown sugar, flour and butter. Mix with a fork until butter is evenly distributed.
Add in apples, cinnamon and white sugar. Mix well.
Overlap three pieces of foil about 18 inches long side by side to create a wider sheet. Place ingredients in the center, folding the sides over and creating a pocket, pinching the ends together to seal the pouch.
Place on a medium hot grill and cook about 15 to 20 minutes, or until apples are fork tender, rotating about halfway through.
Check apples for tenderness at the 15 minute mark.
Serve with vanilla or cinnamon ice cream while still hot for that extra little bit of goodness.